.parant{
	width: 1000px;
	height: 1000px;
	border: 1px solid greenyellow;
	display: flex;
	flex-direction: column;
	flex-wrap: wrap;
	justify-content: space-between;
	align-content: center;
}
.box{
	background-color: aqua;
	border: 1px solid rebeccapurple;
	width: 300px;
	height: 200px;
}